abstract class: “item”

every item has a unique item_id (a positive integer, auto-incremented for each new item), a price (double), and quantity (integer).

Every item can be “Displayed()”, an abstract method, and “Purchased()” (that is removed from the inventory).

concrete class: “book”

a book is-an item. It adds the attributes “author”, “title” and “year”.

concrete class: “gift”

a gift is-an item. It adds the attributes “label”, and “manufacturer”.

Write an application that maintains a list of items entered from the user by means of an interactive menu. The user can:

Add item to the inventory, entering its type (book or gift), and necessary attributes along with quantity.

Display all items.

Display only books sorted by author name.

Display only gifts sorted by label.

Delete an item by item_id

Purchase an item by removing the purchased quantity from the inventory

Bonus: Save items to a file, and loading them back, using object serialization.

Write all necessary classes and methods to ensure the responsibility driven assignment of classes in a pure object oriented approach enforcing all business rules. Document all the rules and classes using Javadoc compatible documentation.

问一下java的排列组合，求大佬解答

Rebel-66

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